Sewing-machine.



mamws,

J. LBATHEM.

SEWING MAOHINE.

APPLICATION IILBD SEPT. a. 1913.

Patented Mar. 2, 1915.

UNTTED STATZiltd PATENT GFFICE.

JAMES LEATHEM, 'OF LEBANON, PENNSYLVANIA, ASSIGNOR TO HERD/[ANN AUKAM 86 00., 0F NEVJ YORK, NQSZZ, A GGRPORATION OF NEW YORK.

SEVJING-MACHINE.

Specification of Letters Patent.

Patented Mar. 2, 1915.

Original application filed July 5, 1912, Serial No. 707,848. Divided and this application filed September 3, 1913. Serial No. 788,012.

To all whom it may concern:

Be it known that I, JAMES LEATHEM, a citizen of the United States, and a resident of Lebanon, in the county of Lebanon and State of Pennsylvania, have invented certain new and useful Improvements in Sewing-Machines, of which the following is a specification.

My invention relates to improvements in sewing machines and particularly to bobbins of such machines.

My invention comprises an improved bobbin construction whereby the removal of the bobbin from the bobbin case is facilitated.

The objects of my invention are to facilitate the removal of the bobbin from the bobbin case; and to avoid injury to the thread in such removal of the bobbin.

1 will now proceed to describe my invention with reference to the accompanying drawings, and will then point out the novel feature in a claim.

In said drawings: Figure 1 shows a side elevation of the so-called hook or loop-taker which carries the bobbin case containing the improved bobbin forming the subject matter of the present invention, the usual projecting lug which holds the bobbin case stationary within the hook being shown. Fig. 2 shows an axial section of the hook, bobbin case and bobbin. Fig. 3 shows an end or top view of the hook with the bobbin and bobbin case therein. Fig. 4 shows a fragmentary detail section of the bobbin, illustrating the provision in the top plate of the bobbin, of grooves into which a sharp instrument may be inserted to get hold of the bobbin when it is desired to withdraw the same.

In the drawings, 1 designates the hook or loop-taker, which is in general of ordinary construction. 2 designates the shaft of such hook, 5 the loop-receiving member or beak, and 6 the thread slot. The loop-taker is not provided, as has been common in the past, with a swinging gate or loose flange-section which normally holds the bobbin in place, but is adapted to be swung to one side to permit removal of such bobbin case; but to the contrary the side or flange 3 of the looptaker is made continuous except for the thread slot 6, other means being provided for retaining the bobbin case in place as hereinafter described.

7 designates the bobbin case which is a hollow cylindrical member provided with the usual central post or arbor 8 for the bobbin, 9, and with the usual projecting lug, 10. The end of the arbor 8 is provided with a head 11 very slightly larger than the body of the arbor, and cut across as shown particularly in Fig. 3, so as to divide the end portion of the arbor into four springs presslng lightly against the hub of the bobbin so as to exert slight retardation to escape of the bobbin from the bobbin case, without materially interfering with the rotation of the bobbin with respect to the bobbin case. To facilitate such spring action the diameter of the arbor is decreased slightly at 12, beneath this head 11. The bobbin case is provided with a projecting rib or flange 13 adapted to rest upon the inwardly projecting rib or flange 14 of the hook 1, such flange 14 serving as a raceway or bearing for the flange 13 of the bobbin case. Slots 15 are provided in the sides of the bobbin case, as shown particularly in Fig. 3, which slots divide the side of the bobbin case into a large number of springs. The extreme edge of the hook I is turned in slightly forming an inwardly turned rib l6, overlapping very slightly the flange 13 of the bobbin case, and so holding that bobbin case in place. The overlap is so slight, and the spring action of the spring sides of the bobbin case is such,

however, that it is easy to force the bobbin case into or out of the hook, the spring sides of the bobbin case yielding slightly to permit this.

The hook 1 is provided in its side with suitable openings 21 through which a suitable instrument may be introduced to pry the bobbin case out of said hook. In inserting the bobbin case into the hook the pres sure of the fingers is sufiicient to press it home.

To remove the bobbin case from the hook, a suitable instrument is introduced through one of the openings 21, between the bottom of the bobbin case and the bottom wall of the hook, and one side of the bobbin case is pried out, the spring leaves forming the greater portion of the side of the bobbin case yielding to permit this. It is then easy to remove the bobbin case; and of course, once the bobbin case has been removed from the hook it is easy to remove the bobbin from the bobbin case.

In replacing the parts, the bobbin is V placed within the bobbinease, and the'latter is theniplace'ol Within the hook'and pressed home, the spring sides of the bobbin case vielding to permit'thefiange 13 to pass the rib 16.

' bobbin out to the several holes "25. When it is desired to remove a bob-bin from its "bobbin case, a needle, pin, or other sharp instrument is introduced into one of these grooves 2 1, under the top plate of the bobbin, and then by this needle or other instrument the bobbin may be pulled out. This can be done in the manner described, without any cutting or weakening of the thread wound upon the bobbin.

One advantage of the construction of bobbin case herein described, 2'. 6., the provision of a large number of spring leaves in the side of the bobbin case, is, that in case the bobbin case becomes Worn or the raceway of r the loop-taker 1 becomes Worn, to such eX- tent that the bobbin case might fly out of the raceway, it is easy by removing the-bobbin, and inserting a suitable tapered mansides of the bobbin case, giving them a perinanent set, suificient to causethernto eni -igage properly In the groove of the looptaker.

In my application for Letters Patent Sr. No. 707 ,848, filed July 5, 1912, now Patent No. 1,099,655, dated June 9, 1914 of which the present application is a division, I have claimed the combination with a hook, of a bobbin case having in its side, springs, as herein described, adapted to engage a rib of the hook when the bobbin caseis inplace Within the hook, as herein described. Therefore such feature i's'not claimed herein.

lVha't I claim is-:

A bobbin comprising-a hub and top plate, said top plate having in it an aperture and having in the underside of said top plate a groove extending back :from such aperture, into which groove a suitable instrument may be inserted to facilitate removal of the "bobbin from its holder.

in testimony whereof I have signed thisspeoification in the presence of two subscribing witnesses.

' JAMES LEATHELL Witnesses:

V F. J. CRYSTAL,

D. A. DAVIES.

, Copies ofthis patent may be obtained 01 five cents each, by addressin t acqmmissioner of E Washington, D. C. 7 7 

